Retraction

后缩

A term used in phonetics to refer to the backwards movement of an articulator, especially the back of the tongue towards the velum. Retracted sounds are heard in velarization, or the centralization of front vowels.

语音学术语，指一个发音器朝后移动，特别是舌后向软腭移动。“后缩”音能在软腭化或前元音的央化中听到。